Dishwasher



Nov. 29, 1927 F. G. BROTZ nIsHwAsHER Filed Feb. 27, 1925 2 Sheets-Sheet 1 1 5 n/ 5. Z /l/L n 7 v H WN 7,l \.\\,|\u|\\\\\ &` Vl\\\ O Z l ATTORNEY.

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F. G. BROTZ Nov, 29, 1927.'

DI SHWASHER Filed Feb. 27, 1925 2 Sheets-Sheet 2 w( TNESSES V EN TOR.

A TTORNE Y Patented Nov. 29, 1927.

UNITED STATESA PATENT OFFICE FRANK G'. BROTZ, OF KOHLER, WISCONSIN, ASSIGNOR TO IKOHLER COMPANY, 0F KOHLER, WISCONSIN, .A CORPORATION F WISCONSIN.

msHwAsHER.

Application led February 27, 1925. Serial 11o-12,032.

This invention relates to dishwashers of lthe type in which a small quantity of water is rapidly circulated and forcibly ejected upon the dishes to remove the dirt by impact 5 and flushing.

The invention has particular reference to dishwashers of the stationary type and especially to those embodied in or permanently combined with a sink y,structure but features of the invention are adaptable for various dishwashers and machines of a similar character where rapid f circulation and forceful ejectment of a fluid are desirable.

The invention has for its object to reduce to a minimum the quantity of water employed and to evenly distribute numerous jets of water from an upstanding column so that the entire space surrounding the column will be included in the effective range. and all of the dishes contained in the receptacle will be thoroughly Claned by the impact and the flushing flow of the water jets over their surface. vAnother object of the invention is to provide a motor driven worm or screw operating in a perforated cylinder with comparatively close fit so that the water will be elevated by the screw and subjected to considerable pressure from the screw to produce the numerous forceful jets of water issuing from the cylinder in all directions and substantially throughout the length of the cylinder.

Another object of the invention is to facilitate thev return of the water to the lower end of the cylinder by means of stationary blades for preventing eddy currents therein and at the same time constituting a support for the basket containing the dishes.

Another object of the invention is to mount the motor permanently beneath the receptacle with provision for excluding water therefrom and for eliminating such water as may find its way along the motor shaft.

Another object of the invention is to provide for ready removal of the cylinder and screw for cleaning.

With the above and other objects in view the invention consists in the dishwasher as herein claimed and all equivalents.

Referring to the accompanying drawings, in which like characters of reference indicate similar parts in different views,

i Fig. 1 is a central vertical sectional View of a dishwasher constructed in accordance with this invention;

Fig. 2 is a sectional plan view thereof on the plane of line 2 2 of Fig. l;

v Fig. Sis a sectional detail view of the drain outlet and the removable strainer, and

Fig. 4 is a view similar to Fig. 1 of a modi- 60 fication in which the cylinder turns with the. screw instead of remaining stationary. y In these drawings, 10 indicates a container which is preferably of enameled iron con struction formed integral with a sink 12. As shown, it is of a general square section with rounded corners, although the sectionalshape may be whatever is desired. The bottom preferably slopes toward the center at a considerable pitch, which will facilitate the water circulation, though at one corner there is a depression 13 containing the usual strainer 14 and waste connection 15, but in addition there is provided a cup-shaped removable strainer 16 for facilitating the re- 75 moval of solids. In practice the drain outlet 15 is controlled by a valve, not shown, and is provided with the common overiow usual with bathtub drains, so that the water level within the container 10 may not exceed a predetermined elevation.

At the center of the depressedbottom of the container 10 is a screw coupling 17 having a conical head 18 to fit the conical depression of the bottom and this coupling is` 854 clamped permanently in place with rubber or other gaskets 19 between the abutting surfaces by means of a clamping nut 20, much in the same manner as the drain outlet coupling is connected to a sink in usual practice. Threaded on the protruding end of the screw coupling 17 is a motor housing cover 2jr and removably attached to it isa motor housing 22 containing an electric motor, the armature of which is mounted on a shaft 23, which has astep bearin'g 24 in the'e'nd of the motor housing, and a bearin 25 in the motor housing cover. This sha t continues upwardly, preferably as a singe shaft, to near the level o f the top'of the container 10 and sur- 100 rounding it is a stationary tube 26 tightly fitting in the :crew coupling 17 and extending to above the maximum water level so that water cannot overflow therethrough. The end'of the shaft 23, which projects aboveV 10:5 the tube 26, is tapered and slotted to have a tight t in the tapering opening a. drive plug 27, which is fixed in the upper end of I the bore of a screw sleeve 28, the slot in the end of the shaft taking one or more ke pins 29 which extend acrosssaid plug an may also extend through the screw sleeve. The lower end of the screw sleeve has a bearing 30 around the tube 26.

A steep pitch blade 31, or a pair of such blades,` as shown, extend the length of the screw sleeve and closely fit within Va cylindrical casing or sprayer tube 32, which is provided with numerous perforations 33, lthrough which the water is ejected by the screw. This casing 32 is preferably removably clamped within a ring 34 carried by radially arranged blades 35 of the head 18 of the screw coupling so that the lower end of the casing is spaced a vsuilicient distance from the head 18 to permit the returning water to enter the lower end of the casing. As shown, a set-screw 36 in said ring 34 serves to clamp the cylindrical casing and hold it stationary. At its upper end the cylindrical casing 32 is provided with a'cover plate 37 carrying a bearin 38 for the reduced upper end of the plu 2 thus giving another bearing for the shaft and assuring the centering of the shaft within the cylinder.

Another ring 39 connecting the outer ends of the blades 35 serves as a support for a basket containing the dishes and as a guard to prevent the hands from coming in contact with the screw. v,

A deflector disk 40 is fixed on the motor shaft below bearing 25 and serves to rotect the motor from water which may d its way along the shaft, there being a utter 4 1 into which the deflector disk would ischarge such water and from which the water would drain through openings 42 provided for that purpose. r j

In operation it isnot necessary with the present invention to use great quantities of ot water for` the dishwasher is desi ed to operate with a minimumquantity o water, approximately one and a half gallons, or the capacity of an ordinary tea kettle, and the v normal level of such quantity of water is approximately that of thetop of ring 39.l The dishes may be arranged on a basket as usual, or otherwise disposed in the container 10, and the-motor is started. The motor runnin at a high speed causes the screw 31 to lift t e water within the perforated casing and subject it to considerable pressure, forcing it out of 'the openings in all directions land for substantially the full length of ther casing, the water issuing from such openings 1n forcible jets, reaching all exposed surfaces with such force as to thoroughly clean the dishes. The' water returning to the bottom of the container is immediately taken up by the Ascrew and again forced through the openings so that practically all of the water` is in active operation all of the time. This permits of the operation bein performed with a minimum quantity o Water. The object in accomplishing the operation with a minimumI quantity of water is to make it ssible to use the water at or near the boillng temperature without the necessity for obtaining sufficient volume by adding wat'er of lower temperature from the water supply as it is found that machines requiring more than the quantity ofl water that it is convenient to' bring to boilin temperature will be operated ineiiciently y the tempering of the water in this manner.

Inasmuch as the jets of water are ejected from' the cylinder in all directions and at all elevations, allsurfaces within the container are subjected thereto, making an efficient cleaning operation under all conditions and, as these jets are horizontal, there is no necessity for a cover for the receptacle, although such cover may be provided if desired.

'Upon completing the washing operation the drain may be opened to draw off the water and the motor may be continued in operation for1 a period to subject the dishes to an air bath for drying, the operation of the screwthen serving as a fan to create the draft necessary for this purpose. hen the motor is stopped and the basket of dishes removed all solid matter will be found collected in the removable strainer 16 and will be removed therewith.

While the perforated cylinder surrounding the screw is stationary, it is obvious that it may be made to rotate with the screw and the modification vshown in Fig. 4 embodies this feature. In this construction the erforated cylinder 32 is made to closel t the screw 31 so as to turn therewith, t e cover 37 being permanentl connected with the cylinder and removab y connected with the plug 27 by means of a screw 43. In this instance the cylinder is somewhat smaller than the ring 34 soas to turn freely therein and, of course, the set-screw 36 is omitted. The operation of-this form of the invention is like that of the other but the turning cylindery causes the jets of water to whirl with it and forcibly sweep over all exposed surfaces within the container.

The presence of the permanently fitted' The'blades 35 direct the water to the forcing screw, so that there is no delay in the return of the water to the action of the screw, and

.serve to prevent anything reaching the screw that will interfere with its operation. These blades with their rings also serve to support the basket of dishes and to position thecylinby Letters Patent is:

1. In a dish-washing machine, a container, a stationary upright perforated cylindrical casing mounted therein having a tightly closed upper end, and a motor-driven screw with its screw blades fitting within the cylindrical casing and extending substantially the full length thereof for lifting water and exerting pressure thereon for forcibly ejecting it through the perforations to produce radially extending powerful jets throughout the container.

2. In a dish-washing machine, a container,

a stationary perforated cylindrical casing standing upright therein having a tightly closed upper end and extending to near the level of the top 0f the container, and a motor-driven screw with its screw blades having closed'itting relation with the walls of the casing to lift water therein and `exerting pressure thereon to forcibly eject it through the perforations in all directions for substantially the full depth of the container.

3. In a dish-washing machine, a container, a stationary perforated cylindrical casing mounted on the bottom thereof having a tightly closed upper end, a motor beneath the container having its motor shaft passed through the bottom of ythe container and into the cylindrical casing, and a s'jcrew carried by the motor shaftrwith its screw blades having close fitting relation wi the perforated walls of the cylindrical casing to lift water from the bottom of the container and exerting pressure thereon to forcibly eject it through the perforations of the casing in radially projected powerful jets.

4. In a dish-washing machine, a container, a threaded coupling member passing through the bottom ofthe container and forming a water-tight connection therewith, a stationary upstanding perforated cylindrical casing mounted on the coupling member within the container and having a tightly closed upper end, a motor threaded on the coupling member beneath the container andV having its,

motor shaft passed through the coupling member, and a screw mounted on the motor shaft within the cylindrical casing for lifting. water therein from the bottom of the container and exerting pressure thereon to forcibly eject it through the perforations in radially projected powerful jets.

5. In a dish-washing machine, a container, a threaded coupling member passing through the bottom of the container and having water-tight connection therewith, ja stationary upstanding perforated cylindrical casing mounted on the coupling member within the container and having a tightly closed upper end, a clamping nut threaded on the cou pling member and engaging the bottom of the container, a motor mounted on the coupling member beneath the container and having its motor shaft passing through the coupling member, a tube projecting upwardly from the couplingvmember and surrounding the motor shaft and extending above the Water level of the container, and a screw mounted on the motor shaft and surrounding the tube and working within the cylindrical casingto lift water from the bottom of the container and exerting pressure thereon to forcibly eject it through the perforations of the cylindrical casing in radially rojected powerful jets.

6. n a dish-washing machine, a container, an upstandinr motor shaft therein, a screw monuted on die motor shaft, and a stationary perforated cylindrical casing surrounding the screw and having a closed end formin a bearin for the end of the screw.

g. In a dis -washing machine, a container, an upstanding motor shaft therein, a stationary sleeve surrounding the motor shaft, a screw mounted on the motor shaft and having a bearing on the sleeve, and a stationary perforated cylindrical casing surrounding Athe screw and having a closed end forming a bearing for the upper end ofthe screw.

8. In a. dish-washing machine, a container, a coupling member passing through the bottom of the container, a motor mounted on the coupling member, beneath the container and having its motor shaft passed through the coupling member, a screw mounted on the motor shaft, radially extending blades on the coupling member within the container, a ring mounted on said blades above the bottom of the container, and a erforated cylindrical casing detachably connected with said ring and surrounding the screw.

91 In a dish-washing machine, a container, a coupling member passing through the bottom of the container, -a motor mounted on the coupling member beneath the container and having its motor shaft passed through the coupling member, a screw mounted on the motor shaft, radially extending blades on the coupling member within the container, aring mounted on said blades above the bottom of the container, and a perforated cylindrical casing detachably connected with said ring and surrounding the screw and having a closed end formin a bearing for the upper end of the motor shaft.

10. In a dish-washing machine, a container, a coupling member passing through the bottom of the container, a motor mounted on the coupling member beneath the con-u tainer and having its motor shaft passed through cthe coupling member, a tubular screw surrounding the motor shaft, a plug fitting in the u per end of the screw and having detachab e key connection with the motor shaft, a perforated cylindrical casingsurrounding. e screw and detachably mounted on the coupling member, and a cover on the end of the cylindrical casing forming a bearing for the plug.

11. In a dish-Washing machine, -a container, a coupling member passing through the bottom thereof, a motor mounted on the coupling member beneath the container and.

tainer, alcou ling member passingl through4 the bottom o the container, a motor having its'motor housing mounted on the coupling member and having its motor shaft passing through the coupling member, a disk on the motor shaft above the motor, there being a.

tter in the motor casing into whichthe isk may discharge water which finds its way along the motor shaft, a screw mounted on the motor shaft, and a stationary. perforated cylindrical casing surrounding the screw.

13. Ina dish-washing machine, a container, a cou lingA member passing through the bottom o the container, a motor mounted on the coupling member beneath the-containerv and having its motor shaft passed through the container, a screw mounted on the motor shaft, radially extending blades the coupling member surrounding the' motor I shaft, a tubular screw surrounding the sleeve,Y

a plug fitting in thevend of the tubular screw. and having detachable key connection with the end of the motor shaft,-and a perforated cylindrical casing surrounding the screw and forming a bearing for the plug.

15. In a .dish-washing machine, a container, a cou ling member passing through the bottom of) the container, a motor mounted on the coupling member beneath the container and havin its motor shaft passed through the container, a screw mounted on the motor shaft, a lperforated c lindrical casing surrounding t e screw, an radially extendingblades on the coupling member within the container to direct water to the screw.

FRANK. G. Bao'ra 

